import { Card, Button } from "antd";
import React, { Component } from "react";
import InvoiceTmp from "./invoice";
import jsPDF from 'jspdf';
import html2canvas from 'html2canvas'

export class StepDetail4 extends Component {
  constructor(props) {
    super(props);
    this.info = props.info;
  }

  download = (title, id) => {
    // setIsLoading(true);
    var element = document.getElementById(id);    // 这个dom元素是要导出pdf的div容器
    var w = element.offsetWidth;    // 获得该容器的宽
    var h = element.offsetWidth;    // 获得该容器的高
    var offsetTop = element.offsetTop;    // 获得该容器到文档顶部的距离
    var offsetLeft = element.offsetLeft;    // 获得该容器到文档最左的距离
    var canvas = document.createElement("canvas");
    var abs = 0;
    var win_i =  document.body.clientWidth;    // 获得当前可视窗口的宽度（不包含滚动条）
    var win_o = window.innerWidth;    // 获得当前窗口的宽度（包含滚动条）
    if (win_o > win_i) {
        abs = (win_o - win_i) / 2;    // 获得滚动条长度的一半
    }
    canvas.width = w * 2;    // 将画布宽&&高放大两倍
    canvas.height = h * 2;
    var context = canvas.getContext("2d");
    context.scale(2, 2);
    context.translate(-offsetLeft - abs, -offsetTop);
    // 这里默认横向没有滚动条的情况，因为offset.left(),有无滚动条的时候存在差值，因此
    // translate的时候，要把这个差值去掉
    html2canvas(element,{
        allowTaint: true,
        scale: 2 // 提升画面质量，但是会增加文件大小
    }).then(function (canvas) {
        var contentWidth = canvas.width;
        var contentHeight = canvas.height;
        //一页pdf显示html页面生成的canvas高度;
        var pageHeight = contentWidth / 592.28 * 841.89;
        //未生成pdf的html页面高度
        var leftHeight = contentHeight;
        //页面偏移
        var position = 0;
        //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
        var imgWidth = 595.28;
        var imgHeight = 592.28 / contentWidth * contentHeight;

        var pageData = canvas.toDataURL('image/jpeg', 1.0);

        var pdf = new jsPDF('', 'pt', 'a4');

        //有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
        //当内容未超过pdf一页显示的范围，无需分页
        if (leftHeight < pageHeight) {
            pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
        } else {    // 分页
            while (leftHeight > 0) {
                pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                leftHeight -= pageHeight;
                position -= 841.89;
                //避免添加空白页
                if (leftHeight > 0) {
                    pdf.addPage();
                }
            }
        }
        pdf.save(`${title}.pdf`);
    });
};

  render() {
    const data = [];
    let total = 0;
    this.info.invoicedtl.map((product) => {
      data.push({
        1: this.info.order_id,
        2: this.info.order_date,
        3: "台",
        4: product.quantity,
        5: product.price,
        6: product.price * product.quantity,
        7: (product.tax * 100).toString() + "%",
        8: (product.price * product.quantity * product.tax).toFixed(2),
      });
      total = total + product.price * product.quantity * (1 + product.tax);
    });

    return (
      <div style={{marginTop:"16px"}}>
        <div id='InvoiceTmp'>
          <Card style={{ margin: "0 18%" }} bordered={false}>
            {/* 希望可以不同电脑都居中 */}
            <InvoiceTmp data={data} total={this.info.total_price} info={this.info} />
          </Card>
        </div>
          <div style={{ textAlign: "center", marginTop:"24px"}}>
              <Button type="primary" onClick={() => this.download('invoice','InvoiceTmp')}>下载</Button>
          </div>
       
      </div>
    );
  }
}

export default StepDetail4;
